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LUHN10 (Credit Card) Validation

A function that validates a credit card based on the LUHN10 algorithm. This function does not care if the number is a visa, mastercard, etc. etc.

Submitted By: skyhawk133

Actions:

Rating:

Views: 14,641

Language: JavaScript

Last Modified: March 29, 2005

Instructions: Pass the credit card number to the function, if it's valid true will be returned, if not, false will be returned.

Snippet

/*---------------------------------------------------------------*/
/* */
/* Function : isCreditCard() */
/* Purpose : Check if cc is LUHN10 */
/* */
/* */
/* Parameters: cc - the cc number */
/* */
/* Returns : boolean */
/* */
/* Usage : isCreditCard(cc) */
/*---------------------------------------------------------------*/
function isCreditCard( CC )
{
if (CC.length > 19)
return (false);
sum = 0; mul = 1; l = CC.length;
for (i = 0; i < l; i++)
{
digit = CC.substring(l-i-1,l-i);
tproduct = parseInt(digit ,10)*mul;
if (tproduct >= 10)
sum += (tproduct % 10) + 1;
else
sum += tproduct;
if (mul == 1)
mul++;
else
mul--;
}
if ((sum % 10) == 0)
return (true);
else
return (false);
}

Copy & Paste

/*---------------------------------------------------------------*/
/*                                                               */
/* Function  : isCreditCard()                                           */
/* Purpose   : Check if cc is LUHN10      */
/*                                                                  */
/*                                                               */
/* Parameters:     cc - the cc number                                                       */
/*                                                               */
/* Returns   : boolean                                              */
/*                                                               */
/* Usage     : isCreditCard(cc)                                           */
/*---------------------------------------------------------------*/

function isCreditCard( CC ) 
     {                         
          if (CC.length > 19)
               return (false);

sum = 0; mul = 1; l = CC.length;
          for (i = 0; i < l; i++) 
          {
               digit = CC.substring(l-i-1,l-i);
               tproduct = parseInt(digit ,10)*mul;
               if (tproduct >= 10)
                    sum += (tproduct % 10) + 1;
               else
                    sum += tproduct;
               if (mul == 1)
                    mul++;
               else
                    mul--;
          }
          if ((sum % 10) == 0)
               return (true);
          else
               return (false);
     }